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Date: Tue, 23 Jun 2009 21:49:16 +0200 From: Miroslav Lichvar <mlichvar@...hat.com> To: Ingo Molnar <mingo@...e.hu> Cc: John Stultz <johnstul@...ibm.com>, Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [GIT pull] ntp updates for 2.6.31 On Tue, Jun 23, 2009 at 09:18:38PM +0200, Ingo Molnar wrote: > > * Miroslav Lichvar <mlichvar@...hat.com> wrote: > > > > > I'm not very familiar with the PPS API, is there something > > > > wrong with it? > > > > > > The PPS patches i've seen just export IRQ timestamps to > > > user-space. > > > > > > That is not very robust in my opinion when it comes to do time > > > approximations - to get quick, low-latency action and precise > > > measurements it's best to keep the critical path as short as > > > possible, and within a single source code repository: i.e. > > > within the kernel. > > > > That's what kernel PPS discipline does, it will be probably > > included later. Its performance is an order or two better than the > > PLL/FLL discipline. > > Is there some kernel patch i can look at? It's in the old PPSkit patches for 2.4 kernels, function hardpps(). -- Miroslav Lichvar -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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